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UNITED STATES PATENT OFFICE.

CHARLES H. 'cow/'Dann oE EITGHBURG, MASSACHUSETTS.

sl-:LF-olLlNe PULLEY.

SPECIFICATION forming part of Letters Patent No. 255,418, dated March28, 1882'.

Application filed February 17, 1882.

'o all whom tt may concern Be it known that I, CHARLES H. COWDREY, ofFitchburg, county of Worcester, and State of Massachusetts, haveinvented an Improvement in Self-Oiling Pulleys, of which the following.description, in connection with the accompanying drawings, is aspecitioation.

This invention in selt'oiling pulleys has for its object such aconstruction of the pulley as will compel a proper circulation of theoil there.

' in motion the oil in the annular chamber ofthe pulley.

Figure l represents, in side elevation, a selfoilin g pulley supposed tocon tain my improvements, and Fig. 2 a horizontal section thereof on theline xx.

The hub a of the pulley which runs on the shaft b is bored radiallytoform a series of oil-holes, c' a', leading directly to the shaft, andwith other series, tazas, leading partially into the said hub, where'they are intersected by holes, n.4 c5, bored from the ends of the huba, the holes a4 c5 also intersecting the annular grooves c c', made atthe interior of the hub..

The rim part77 d of thepulley, as I denominate all that part of itoutside the hub a, is

' cored and cast to form a shell with chambers or spaces d d? d3, therebeing left in the chamber d2 a series of six onmore prongs or fingers,c, shown in section in Fig. 2, and in dotted lines, Fig. 1, the saidprongs or lingers extending from the interior of the belt-receiving partot' the pulley toward lthe hub and tapering to a point toward thehub,the free ends of the said prongs terminating preferably at oropposite the openings a/leading through thehub to the shalt b. In orderto enable the soil to circulate in the said rim, it is providedwith pas-(No model.)

sagesfg, formed by boring or drilling a hole through the dividing websor walls of the rim from side to side, the said holes being subsequentlyclosed at lthe loutsides of 4the rim by screws f or otherwise, toprevent the escape of oil. The holes a4 a5 are for a like reason closedby the screws 7i h?. The oil or otherlubricant to lubricate the pulleyis introduced therein through an inlet in the outer or b eltreceivingface of the rim,`the said inlet being closed by a screw or other plug,7c. (Shown in dotted lines.) t.

' The prongs or lingers c resting in the oil in the annular chambercl2-keeps the said oil in agitation and circulation as the Ipulley isrotated. The dotted vlines on the shaft b, Fig. 2,

represent oil-passages in the hub at the other side of the shaft,passages like those already described. The oil introduced at theinlctinto the chamber d2 tio ws through passages a to the shaft b,thence between the hub and shaft to the annular grooves cc', thence outalong passages ct a2 into chamber d', or along passages a5 a3 intochamber d3, and from the said chambers d d3, through the passages f g,back again into chamber d2. Whenever the prongs or lingers c areuppermost, the oil in the chamber d? iiows readily down over them to thehub. The tapered fingers e also act to overcome the centrifugal tendencyof the oil to fly out and remain out against the wallsof the chambersd2, most remote from the shaft b. The rin; is driven or shrunk on thehub a, so that the two are practically fixed together im'movably, and soas to prevent the passage of oil from the jcint between them.

The annular grooves c c in the hub enable meto carry the oil out beyondVthe chambers d d3 quite to the ends of the hub.

.c c', the latter being located nearer the end of IOO the hub than thechambers d d3 ottherim, and with passages a4 a2 a5 a3, combined with therim (l, having communicating chambers d d2 d3, substantially as and forthe purpose described.

3. In a self-oiling pulley, the east-metalrim provided with the chamberd2, and the prongs and fingers e, located therein, as set forth,eombined with the hub a, provided with oil-pas sages a', substantially asshown, and for the purpose described.

4. As an improved article of manufacture, a cast-metal pulley composedof a chambered rim and a hub provided with oil-passages to permit thecirculation of oil introduced into a 15 chamber of the rim through thehub to the shaft, along the shaft, and back into the chambers of therim, as set; forth, the said chambered rim being driven or shrunk uponthe said hub, substantially as described, to form an oil-tight 2c jointbetween them.

In testimony whereof Ihavesigned my name to this specification in thepresence of two subscribing witnesses.

CHARLES H. COWDREY. Witnesses:

G. W. GREGORY, ARTHUR REYNOLDS.

